Deoxyribonucleic acid (DNA) is a nucleic acid that contains genetic instructions for regulating the structure and function of an organism. All living things have DNA genomes. One possible exception is some virus groups that have RNA genomes , but viruses are not usually considered living organisms. The main function of DNA in cells is to store information for a long time. The genome is sometimes compared to a blueprint because it contains instructions for the formation of different parts of the cell , such as proteins and RNA molecules . The part of DNA that carries genetic information is called a gene , but other DNA sequences have structural significance or are used to control genetic information. In eukaryotes, such as animals and plants , DNA resides inside the nucleus , but prokaryotes, such as bacteria , reside in the cytoplasm of DNA cells. Like enzymes, DNA does not directly participate in most biochemical reactions ; Basically , different enzymes work on DNA to mimic its information and make more DNA through replication , or by copying and converting it into proteins. Chromatin proteins in chromosomes, such as histone, condense and regulate DNA , which helps regulate its behavior with other proteins in the nucleus. DNA nucleotide is a long polymer consisting of simple molecules attached to the spine consisting of sugar and phosphate groups. There are four types of molecules in this spinal cord called alkalis , the sequence of these four bases contains information. The main function of DNA is to make a sequence of amino acids from proteins using genetic code. Cell nucleic acids replicate certain parts of DNA in RNA to read the genetic code. Some RNAs are used to control the synthesis of fake protein biosynthesis ;